OpenDBX 1.2.4 released

Release focus: Minor bugfixes

Changes:
This bugfix release contains a backport from the development branch which removes the automake dependency from the main OpenDBX header file (odbx.h) and fixes the SYBDATETIME4 type definition in the mssql backend. Furthermore it adds support for the SYBLONGCHAR and SYBLONGBINARY types in the mssql backend. It also contains a fix in the regression test program so that it will build on the latest Linux installations. The documentation was updated.