gnucap-dev package

Hi there.

the current gnucap package lacks development support. i think thats bad,
but YMMV. i've prepared a git repo that contains
alioth/pkg-electronics/gnucap plus a few patches at
git://tool.em.cs.uni-frankfurt.de/git/gnucap_deb in the "dev" branch.

the upstream related patches (quilt) are
- src/Makefile.am: install headers to $(pkgincludedir)
- Makefile.am: install gnucap-conf script that knows about paths
- src/Makefile.am: add RPATH flag to gnucap executable, which is needed
  to locate future plugins.

the package related patches do
- use dh_autoreconf to simplify build system patches
- build gnucap-dev package (modelgen, gnucap-conf, headers)
- gnucap-dev conflicts with older gnucap (modelgen)
- enable parallel build

i do not know about how upstream is planning to solve that. in any case
i'd appreciate something like the proposed patches in an upstream
release. or a discussion about alternatives.

regards
felix

PS: with your consent i'd push these changes myself, but im not even a
pkg-electronics member...