bugfix and compression improvements
bugfix and compression improvements

squash bug that prevented subroutines from spanning to the end of a
charstring, remove useless substrings at each iteration, consider the
effect of subroutinization within a subroutine when calculating subr
savings, other miscellaneous items

googlei18n/compreffor,moyogo/compreffor,googlefonts/compreffor,bitforks/compreffor,bitforks/compreffor,anthrotype/compreffor,googlei18n/compreffor,behdad/compreffor,moyogo/compreffor,wskplho/compreffor,anthrotype/compreffor,moyogo/compreffor,anthrotype/compreffor,behdad/compreffor,googlei18n/compreffor,googlefonts/compreffor,behdad/compreffor,wskplho/compreffor