cleanup, correctly quote twsapi includes
style, correct comment headline in source files
maint, update all copyright year number ranges

Run "make update-copyright" from coreutils repo.
For the record this cmd line was used:

UPDATE_COPYRIGHT_USE_INTERVALS=1 \
UPDATE_COPYRIGHT_HOLDER="Ruediger Meier" \
~/src/coreutils/build-aux/update-copyright $(git ls-files)

Note, twsdo_main.cpp and twsgen.cpp still have to be updated manually.
maint, update copyright note in --version to 2013
Merge branch 'maintenance'

* maintenance:
  maint, update copyright note in --version to 2013
  maint, update all copyright year number ranges
  style, correct comment headline in source files
  cleanup, correctly quote twsapi includes
build, don't define TWSAPI_VERSION twice
build fix, check for twsapi_config.h ignores default include paths
build, don't use private pkg_cv_* vars
style, include twsapi_config.h before other twsapi headers

... because some more headers may be included dependent on version.
Merge branch 'fix_twsapi_config'

* fix_twsapi_config:
  style, include twsapi_config.h before other twsapi headers
  build, don't use private pkg_cv_* vars
  build fix, check for twsapi_config.h ignores default include paths
  build, don't define TWSAPI_VERSION twice