don't inherit the style from the title, related bnc#880488

It seems that inheriting the style from the title for the subtitle is
just wrong.

Change-Id: Icbedf3e934b13514e50a1354552e5d6a8d139095
fix wrong operator<< for Color

Change-Id: Iccaf173fc15466f8d0604e3d0e4cd2c790902db4
extract some shared code

Change-Id: Idfbbee6dc0bd5a63ae46ea8375270a475ef3521b
extract a bit more code

Change-Id: I24da9b5e8594d34ff7d5c3f958c2fd1c5cad1908
split sd's import and export tests

Change-Id: I06d5b02ec94c7bb74b64cd210267acf2be1a4931
enable ODP export validation in sd export test

Change-Id: I849d2f0d8631cfb91326d80e554c9ce55940abd8
improve test failure message

Change-Id: I71d6b65b046bfc31692ba12423288c55fccb2d02
remove unused header file

Change-Id: I78c2462f56fb4b5792f396bb7e0dd2c0fd237420
document strange code, coverity#704001

Change-Id: Id6668f47f0549e719010141929b011aa028812d2
make the validation working correctly

We still have ODP validation errors of the form:

Change-Id: Id60df0e07a0b6d3fd2613d5c66698a6cd9b99afd
Error: attribute "draw:fit-to-size" has a bad value. Possible values
are: false,true