Merge pull request #1 from joequant/master

Major enhancements to PG2PLplot by joequant
Change PGPlot ps to PLplot ps

* Change PGPlot ps to PLplot ps:
  * in subroutine pg2pldev()
Merge branch 'local_changes'
Updated copyright statement, removed compiler warnings

* Updated copyright statement, removed compiler warnings:
  * added joequant to copyright statment
  * solved some minor/silly complaints from g95 and ifort
Added README
Updated README
Reapplied changes lost after v0.1.4
Added warnings (if requested) when using a new dummy routine
Updated CMake files to CMakeFiles rev.24
Minor updates: format, comments, etc.
Fixed Doxygen comments
add missing declare
add pkg-config and use /usr/share conventions