Update documentation.

Explain how to install my base POM and point to
"interesting" classes in the helper library.

README.md

@@ -18,16 +18,39 @@ This plugin extracts an user-specified selection of frames from a
 hyperstack and generates a new image containing the selected frames
 disposed in a array.
 
+Helper Library
+--------------
+Bundled with the plugins is a small library of helper classes for use in
+other plugins or scripts. Notable classes include `BatchReader`, to
+facilitate batch processing of images listed in a CSV input file, and
+`ChannelMasker`, to facilitate the creation and manipulation of
+binary masks. Refer to the package´s [Javadoc]
+(https://incenp.org/dvlpt/imagej-plugins/apidocs/index.html) for more
+details.
+
 Installation
 ------------
-Build the plugins with [Maven](https://maven.apache.org/) by running
+To build the plugins with [Maven](https://maven.apache.org/), first
+install the parent POM from my own repository by running
+
+```
+$ mvn dependency:get -DgroupId=org.incenp -DartifactId=incenp-base \
+  -Dversion=1.1.0 -Dpackaging=pom \
+  -DremoteRepositories=https://mvn.incenp.org/repo/releases
+```
+
+You can then build the plugins by running, from the source directory
 
 ```
 $ mvn package
 ```
 
-in the source directory. Then copy the generated JAR file (found in the
-`target/` folder) to the `plugins` folder of your ImageJ installation.
+Then copy the generated JAR file (found in the `target/` folder) to the
+`plugins` folder of your ImageJ installation.
+
+(Pre-compiled JAR files are also available for each release on the
+[releases page](https://git.incenp.org/damien/imagej-plugins/releases)
+for the project.)
 
 Once installed (and after restarting ImageJ if it was already running),
 the plugins will be available in the `Plugins > Incenp.org` menu.

src/site/apt/index.apt

@@ -38,8 +38,14 @@ Java library
   classes that may be used in other ImageJ plugins or scripts. Those
   classes are under the <<<org.incenp.imagej>>> namespace.
   
-  Refer to {{{./apidocs/index.html}API documentation}} of the library to
-  know what classes are available and what you can do with them.
+  Refer to the {{{./apidocs/index.html}API documentation}} of the
+  library to know what classes are available and what you can do with
+  them.
+  
+  Notable classes include the <<<BatchReader>>> class, to facilitate
+  batch processing of images listed in a CSV input file, and the
+  <<<ChannelMasker>>> class, to facilitate the creation and manipulation
+  of binary masks.
 
 
 Setup
@@ -73,8 +79,16 @@ $ git clone https://git.incenp.org/damien/imagej-plugins.git
 
   The project uses {{{https://maven.apache.org/}Maven}} as its build
   system, so you need to have Maven installed with the <mvn> command
-  available from the shell. Then, simply run the following command from
-  the source directory:
+  available from the shell. You will then need to install the parent
+  POM by running:
+  
++-------------------------------------------------------------------
+$ mvn dependency:get -DgroupId=org.incenp -DartifactId=incenp-base \
+  -Dversion=1.1.0 -Dpackaging=pom \
+  -DremoteRepositories=https://mvn.incenp.org/repo/releases
++-------------------------------------------------------------------
+  
+  Then, simply run the following command from the source directory:
   
 +------------
 $ mvn package