Moved Boost Serialization code to new package.
Integrate the new CondDB code with the Boost Serialization code.
Moved classes.h headers to headers.h to avoid duplicated 'struct dictionary'
Remove SKIP_REFLEX_DICT flag since it is not required anymore.
Add test for CondFormats/External
Complete support required for all DB types.
Merge pull request #1169 from ojeda/booser

Integrate the new CondDB code with the Boost Serialization code