mod-1.1.1 released

This new development release fixes quite a few things from the 1.1.0 release, which added support for dynamic navigation trees. Here is a list of the major changes:

* an install.pl script has been added that installs the /usr/local/lib/mod/ directory, in addition to the mod2html script and man page. Locations of common elements can be modified in the install script and it will do the right thing.

* a man page for mod2html has been provided.

* mod2html will now offer to create the .mod/ directory and its contents for you if it does not already exist.

* fixed a bug that would cause the dynamic navigation tree to fail of there were any single quotes in any of the topics/subtopics.