Initialize transactionActive in constructor
add api documentation about the drivers
update build:
 * autoconf wants configure.ac instead of configure.in
 * INCLUDE in Makefile.am is obsolete; AM_CPPFLAGS should be used
build improvements:
 * disable static build by default
 * autodetect oci (oracle call interface)
Merge branch 'master' of github.com:OlafRadicke/tntdb