Refactor so that header parsing is possible after changing qualifier and separator strings.

git-svn-id: svn+ssh://svn.savannah.nongnu.org/gap/trunk@2743 d25b4930-3292-e311-b074-0010c6de5da8
Refactor so that header parsing is possible after changing qualifier and separator strings.

git-svn-id: svn+ssh://svn.savannah.nongnu.org/gap/trunk@2744 d25b4930-3292-e311-b074-0010c6de5da8