Update NTL to version 6.2.0.
Let FLINT build against NTL 6.2.
Update FLINT patch revision.
Fix some template issue with NTL 6.2.0.
Update NTL to version 6.2.1.
Fix checksum for NTL.
Refreshing patches and new configure.ac to generate a libtool that supports c++ properly.
Correct patch and change ordering between libtool generation and patching in spkg-install
Reseparate make.patch properly from the libtool patch
Update Singular to 3-1-7.
Let Singular instantiate NTL templates.
Merge remote-tracking branch 'trac/u/fbissey/ntl-6.2.1' into ticket/16882
Merge remote-tracking branch 'trac/develop' into ticket/16882

Conflicts:
	build/pkgs/flint/package-version.txt
	build/pkgs/singular/package-version.txt
Rebase Singular patches.
Upgrade to Singular-3-1-7
Upgrade to NTL 6.2.1
Update patch documentation for NTL and Singular.
Merge remote-tracking branch 'trac/u/jdemeyer/ticket/16882' into ticket/16882

Conflicts:
	build/pkgs/singular/SPKG.txt
Document templates.patch
Update patches for Singular 3-1-7.