Osmorc Code

* fixed OSMORC-43

* fixed OSMORC-97

Added header provider repositories for Equinox and Spring DM. Currently the only effect of this is that header names special to Equinox and Spring DM are recognized.

OSMORC-91: Fixed or at least minimized the probability of its occurence.

OSMORC-105: Changes to a file that is part of the additional JAR contents now trigger a rebuild of the bundle JAR on the next execution of a run config.

OSMORC-112: Osmorc now refreshes the folders containing binary and source bundles before searching for the bundles to make sure that all current files will be found.

OSMORC-73: A working first attempt at adding support for Eclipse 3.4.1 source bundles. It works but is not perfect and should be replaced by a solution that actually uses the Eclipse-SourceBundle of the source bundles.

OSMORC-85: The loading of an existing or the creation of a new manifest file is postponed if the module does not yet have a content root.

Fied a typo

Made the migration from old additional JAR contents handling easier. The edit action for an old entry searches it in the content roots of the module and preselects it in the file chooser if it could be found.