hgrc: drop obsolete stuff from [alias], enable showfunc in [diff] The alias entry for diff (-p) is the same as [diff] showfunc = 1, but the latter will also do things like improve emails.

setlocal tabstop=4
setlocal softtabstop=4
setlocal shiftwidth=4
setlocal textwidth=80
setlocal smarttab
setlocal expandtab
setlocal smartindent