Enable HTTP keep-alive.  This should (I hope) noticeably improve end-user performance.

Also remove a bogus network property setting (an integer property was being set to true).

git-svn-id: svn://svn.code.sf.net/p/kolmafia/code@11948 b29ace70-8910-0410-8dcc-aa2fc6433167
let PulverizeRequest pulverize back items

git-svn-id: svn://svn.code.sf.net/p/kolmafia/code@11949 b29ace70-8910-0410-8dcc-aa2fc6433167
don't keep-alive when sharing mall prices.

git-svn-id: svn://svn.code.sf.net/p/kolmafia/code@11950 b29ace70-8910-0410-8dcc-aa2fc6433167
Fix quality listing for some Jarlsberg foods

git-svn-id: svn://svn.code.sf.net/p/kolmafia/code@11951 b29ace70-8910-0410-8dcc-aa2fc6433167