Fixed occasional incorrect update of contig used end position.

Put in check that seq_end has actually been set in contig_insert_base2
before using the value.

Removed some dead code.


git-svn-id: svn://svn.code.sf.net/p/staden/code/staden@3615 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1
Debugging aids for contig deletion/insertion

git-svn-id: svn://svn.code.sf.net/p/staden/code/staden@3616 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1