Improve name representation: put index first.
Improve name representation: Unpack fields.

This uses the fact that the String in a Name cannot be empty to put the
first character of the string into the Name itself.
Merge pull request #91 from Toxaris/unbox-name-components

Unbox name components.
Document ctags configuration

This is not perfect, as our language is not really regexp-friendly.
Merge pull request #92 from Blaisorblade/topic/ctags

Document ctags configuration.
Add faster variable freshening

Comparing with master:

$ time pts --quiet --instance uu UU/D/count.lpts

real	0m5.665s
user	0m5.574s
sys	0m0.075s
$ time ./pts-master --quiet --instance uu UU/D/count.lpts

real	0m6.063s
user	0m5.969s
sys	0m0.076s

I repeated this more often, and the results look relatively stable.

For testing, I've used
Toxaris/tsr-experiments#636a1f5f9a6c79f8becaa98486f80a3f1c00221f with
`countRebuildIncompl` commented back in.
Speed up operations with insertLookupWithKey