monoblue: port code selection without line numbers from gitweb
This is adapted from 2239626369f5.
It also fixes issue4790 in monoblue; tab characters now have meaningful width on
the modified pages (file view, file diff, changeset).
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing:
$ make local # build for inplace usage
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