tinyTiM CXTM 1.5.0beta released

Bugfix release of the tinyTiM CXTM subpackage. The CXTM subpackage implements the CXTM draft dtd. 2008-05-15 and is used to serialize topic maps into CXTM.

Unless we get more bug reports, this release will become the official
tinyTiM CXTM 1.5 release in a few weeks.