Update docs for version 2.3

doc/main.dox

@@ -6,7 +6,6 @@ EPANET is a program that performs extended period simulation of hydraulic and wa
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 @image html DistributionSystem.png
-@image latex DistributionSystem.eps
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@@ -17,6 +16,7 @@ The OWA-EPANET Toolkit is an open-source version of the original EPANET Toolkit
 - allowing networks to be built completely from function calls instead of from an input file
 - allowing multiple projects to be analyzed in parallel in a thread-safe manner
 - adding the ability to use pressure dependent demands in hydraulic analyses
+- adding the ability to model fixed and variable area leakage in pipes
 - producing more robust results with regard to hydraulic convergence, low/zero flow conditions, and water quality mass balance
 - achieving faster run times for single period hydraulic analyses.
 
@@ -25,7 +25,7 @@ Before using the OWA-EPANET Toolkit one should be familiar with the way that EPA
 - @subpage DataFlow "Data Flow Diagram"
 - @subpage ToolkitVersions "Toolkit Versions"
 
-More detailed information can be obtained from reading the <a href="https://nepis.epa.gov/Adobe/PDF/P1007WWU.pdf">EPANET 2 Users Manual</a>.
+More detailed information can be obtained from reading the <a href="https://epanet22.readthedocs.io/en/latest/index.html">EPANET 2 Users Manual</a>.
 
 __Note:__ <a href="https://github.com/OpenWaterAnalytics">OWA (Open Water Analytics)</a> exists on GitHub as an open community for the exchange of information and ideas related to computing in the water & wastewater industries. Its activities and code projects are neither affiliated with nor endorsed by the USEPA.
 */
@@ -38,7 +38,6 @@ EPANET models a pipe network as a collection of links connected to nodes. The li
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 @image html Network.png
-@image latex Network.eps
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@@ -59,15 +58,14 @@ being taken and if false result in a different set of actions being taken
 
 An EPANET model also contains a number of analysis options that specify:
 - the project's flow units which in turn determines its unit system (US or SI)
-- the formula used to compute head loss
+- the formula used to compute pipe head loss as a function of flow rate
 - whether to use a demand driven or a pressure driven analysis
-- hydraulic convergence criteria
+- hydraulic convergence criteria and water quality tolerances
 - time steps used for hydraulic, water quality and reporting
 - the type of water quality analysis to perform (chemical reaction, source tracing or water age)
-- global values for chemical reaction coefficients that can be overridden for individual pipes
 - global values for energy usage parameters that can be overridden for individual pumps.
 
-Please refer to the <a href="https://nepis.epa.gov/Adobe/PDF/P1007WWU.pdf">EPANET 2 Users Manual</a>
+Please refer to the <a href="https://epanet22.readthedocs.io/en/latest/index.html">EPANET 2 Users Manual</a>
 for more information on EPANET's data model.
 */
 
@@ -79,7 +77,6 @@ The EPANET Toolkit contains separate code modules for network building, hydrauli
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 @image html DataFlow.png
-@image latex DataFlow.eps
 </td></tr>
 </table>
 
@@ -104,7 +101,7 @@ with single threaded applications.
 analyzed concurrently.
 
 Both Toolkit versions utilize identical function names and argument lists with the following exceptions:
-- The `#include "epanet2.h"` directive must appear in all C/C++ code modules that use the single-threaded library while `#include "epanet2_2.h"` must be used for the multi-threaded library.
+- The <b>`#include epanet2.h`</b> directive must appear in all C/C++ code modules that use the single-threaded library while <b>`#include epanet2_2.h`</b> must be used for the multi-threaded library. (The "_2" portion of the latter file's name means it is the second of two header files provided and is not a minor release number.)
 - Function names in the single-threaded library begin with \b EN while those in the multi-threaded
 library begin with \b EN_ .
 - The multi-threaded functions contain an additional argument that references a particular network project