misc: Add cr_str_to_nevr() and cr_str_to_nevra() and types cr_NEVR and cr_NEVRA
misc: The struct cr_EVR type replaced by the cr_EVR *
misc: Replace struct cr_NVREA * with cr_NVREA *
misc: Replace usage of the cr_NVREA with the cr_NEVRA instead
Adapt code to the new types
misc: Make the function for NEVR and NEVRA parsing more generic
xml_file: Support for prestodelta.xml format
error: Add support for deltarpm failures
parsehdr: Remove unused include
bash completion: Add support for delta related args
Deltarpm support (Experimental - the used drpm library is not stable!)

Git of the DRPM library: https://git.fedorahosted.org/git/drpm.git

Check the README.md for information how to build createrepo_c with delta rpm support

Note: Delta rpm support is disabled by default
Bump to 0.5.0