Enable menus after loading single reads from a fasta file.

git-svn-id: https://staden.svn.sourceforge.net/svnroot/staden/staden/trunk@3193 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1
Fixed a memory error where I accessed a pointer immediately after
freeing it in cache_flush().


git-svn-id: https://staden.svn.sourceforge.net/svnroot/staden/staden/trunk@3194 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1