Little fix for external ColPack.cmake issue #1529
added a comment on how to specify different compilers
Merge pull request #1541 from karlnapf/develop

added a CMake Readme comment on how to specify different compilers
Revert "Little fix for external ColPack.cmake issue #1529"

This reverts commit 85b5000ed2ce4d0e04dbc89c4c4e2bd556e45671.

This broke the build
Merge pull request #1542 from karlnapf/develop

fix colpack build
Guard LMNN with HAVE_LAPACK due to PCA use.
Merge pull request #1544 from iglesias/develop

Guard LMNN with HAVE_LAPACK due to PCA use.