#2 fixes and amsmath feature

[Dimitris Michail]

Here is a patch for the 0.1 version which does the
following:

- texfig can now be called from a different directory
than the
input fig file.
- an option -watch is added to call gv with watch
enabled.
- option -ams,-amsmath,-amssymb include in the generated
latex file the packages amsmath and amssymb, in
order to
be able to use more complex math in the text.

-- Dimitris

[Dimitris Michail]

ams support and bugfixes