Fixes#195.
* tests/ltsmin/check.test: Extract the spins and gal checks
and move them to...
* tests/ltsmin/check2.test, tests/ltsmin/check3.test: ... these files.
* tests/Makefile.am: Adjust.
This fixes c9aabcdd.
* spot/ltsmin/ltsmin.cc: Update the extension after compiling
the model. Do not duplicate the symbol lookups for DVE and gal2C.
Also, improve error reporting in case of missing symbol.
* tests/ltsmin/check.test: Remove stray character.
* spot/ltsmin/ltsmin.cc: Handle GAL models.
* tests/Makefile.am: Test the new feature.
* tests/ltsmin/check.test: Also check GAL.
* tests/ltsmin/beem-peterson.4.gal: A new GAL model for tests.
* tests/ltsmin/finite.gal: A new GAL model for tests.
* tests/ltsmin/finite3.test: A new test for GAL.