[cleanup] Remove entries from .gitignore related to in-source-builds

.gitignore

-# Stuff to ignore recursively
-*.la
-*.lo
-*.log
-*.o
-*.trs
+# ignore all build folders
+/build*/
+# ignore backup files
 *~
+# ignore Python files
 *.pyc
-.deps/
-.libs/
-Makefile
-Makefile.in
-TAGS
-
-# Stuff to ignore in this directory only
-/aclocal.m4
-/autom4te.cache/
-/build-*/
-/compile
-/config.guess
-/config.h
-/config.h.in
-/config.log
-/config.lt
-/config.status
-/config.sub
-/configure
-/configure
-/configure.lineno
-/depcomp
-/dependencies.m4
-/dune-common-*.tar.gz
-/dune-common-?.?
-/dune-common.pc
-/dune.css
-/install-sh
-/libtool
-/ltmain.sh
-/missing
-/mkinstalldirs
-/stamp-h1
-/test-driver

bin/.gitignore

-/check-log-store

doc/buildsystem/.gitignore

-/*.aux
-/*.backup
-/*.dvi
-/*.ilg
-/*.ind
-/*.out
-/*.pdf
-/*.ps
-/*.toc
-/auto

doc/comm/.gitignore

-/communication.aux
-/communication.bbl
-/communication.blg
-/communication.log
-/communication.out
-/communication.pdf
-/communication.toc
-/indexset
-/poosc08
-/poosc08_test

doc/doxygen/.gitignore

-/Doxyfile
-/Doxyfile.in
-/doxy-header.html
-/doxy-footer.html
-/bestpractice.html
-/doxygen-tag
-/doxygen.log
-/doxyerr.log
-/html/
-/html-dist
-/latex

dune/common/parallel/test/.gitignore

-/indexsettest
-/indicestest
-/selectiontest
-/syncertest
-/variablesizecommunicatortest

dune/common/test/.gitignore

-# The test binaries (in alphabetical order)
-/arraylisttest
-/arraytest
-/bigunsignedinttest
-/bitsetvectortest
-/blockbitfieldtest
-/calloncetest
-/check_fvector_size
-/conversiontest
-/diagonalmatrixtest
-/dynmatrixtest
-/dynvectortest
-/eigenvaluestest
-/enumsettest
-/fmatrixtest
-/fvectortest
-/gcdlcmtest
-/integersequence
-/iteratorfacadetest
-/iteratorfacadetest2
-/lrutest
-/mpicollectivecommunication
-/mpiguardtest
-/mpihelpertest
-/mpihelpertest2
-/nullptr-test
-/parametertreelocaletest
-/parametertreetest
-/pathtest
-/poolallocatortest
-/shared_ptrtest
-/shared_ptrtest_config
-/shared_ptrtest_dune
-/singletontest
-/sllisttest
-/static_assert_test
-/streamtest
-/stringutilitytest
-/testdebugallocator
-/testdebugallocator_fail1
-/testdebugallocator_fail2
-/testdebugallocator_fail3
-/testdebugallocator_fail4
-/testdebugallocator_fail5
-/testfconstruct
-/testfloatcmp
-/timing_flt
-/timing_old
-/timing_xpr
-/tuplestest
-/tuplestest_dune
-/tuplestest_std
-/tuplestest_tr1
-/tupleutilitytest
-/typetraitstest
-/typetraitstest_deprecated
-/utilitytest

lib/.gitignore

-/libdunecommon.la