Scripts: Find library also when in CTAN directory structure

In the CTAN archive the Python scripts will be in bin/
while the library file(s) will be in lib/

This commit ensures that the library is found when
- it is in the same folder (as in the Git repository)
- it is in '../lib' (as in CTAN)
- in an arbitrary folder in the TEXMF tree (as in distros).
genericAccess.inp: Revert luatex accomodation for \lilyPrint

After having settled installing Emmentaler in the texmf tree it isn't necessary anymore to differentiate font loading.
Manual: Retouch Quick Start
Manual: Review installation chapter and INSTALL

As of 2013-09-13 this seems to be the final way how Emmentaler is accessed.
Well, some feedback from Windows users still missing.
Manual: Add reference to glyphlist
Manual: Review usage chapter
lilyglyphsStyle.sty: Fix \ghIssue
Manual: Review Reference Chapter
Manual: Review Generic Access Commands section
Manual: Review Directory Structure section
Manual: Finish revision of Internals chapter
Manual: Review Python chapter
Manual: Review Contributing section
Incorporate revision of Manual