Fixed tests using new file structure for personal environment variables.
Added test cases for library environment variable and bibtex (default)
reference file variable.
Pdfs will be compiled, replacing special characters with underscores;
this fix also looks for underscored files when trying to open the
compiled version of a file.
The Library environment variable (for my default bibtex library
directory) overwrote yay's library directory; it has been renamed to
LIBRARYROOT to both mirror WIKIROOT as my note directory and keep the
LIBRARY variable empty so yay will continue working.
