documentation
no undocumented symbols left... but several need much better docs
Merge branch 'Bertini' into NAG
changed things in PHCpack.interface...
a way to handle aux dir for a package
SYSTEMS reorganized
embedded comps, but reduced isolated comps
Software option mess in decomposition routines fixed; PHCpack trackPath interface switched start and target; other small things
interface PHCpack mixedVolume; wrapped PHCpack routines -- output parser seems to digest only _global_ variables
still wrong: bugs/anton/Bertini/witness_set_bug.m2
Merge branch 'NAG' of github.com:antonleykin/M2 into Bertini