Add ability to check version compatibility #430

We need a way for the external APIs (like Java) to be able to check if it is compatible, when calling utPLSQL, so that the calling (Java) API can first check if the version that it is depending on is compatible with current version.
That could be done by providing a compatibility check.
ut_run.check_compatibility_with_version( a_version varchar2)
The function would return true/false depending on the result of check.
The check would execute the following pseudo-code:

begin
  l_result := false;
  l_version = current_version number (major.minor.bugfix);
  if a_version.major = l_version.major
     and (a_version.minor = l_version.minor 
          or a_version.minor = l_version.minor and a_version.bugfix <= l_version.bugfix) then
    l_result := true;
  end if;
  return l_result;
end if;

So versions are compatible:

• if major is equal and framework minor >= requested
• if major is equal and minor is equal and framework bugfix >= requested