New phxmail-develop package added

In order to make use of the file-release system and the file download statistics, a new package is created.

On a regular base, a snapshot of the current sourcecode in CVS is compiled and the compiled program is added to this package as an alpha release.

Use this alpha release only if you want to test fixed bugs or implemented features, because it is likely that this release contains bugs and unfinished new features.

- Marco