Use CMAKE_BUILD_TYPE for splash2txt

 - use CMAKE_BUILD_TYPE instead of S2T_RELEASE cmake option
 - fix a compile error with gcc 4.9 (uint32_t undefined)
Update splash2txt cmake

 - fix boost warnings
 - add -Wall
Merge pull request #591 from f-schmitt-zih/topic-cmakebuildtype

Fix #554 Use CMAKE_BUILD_TYPE for splash2txt