Implements BITAND, BITOR, BITXOR, BITLSHIFT and BITRSHIFT as specified by
OASIS OpenDocument Format 1.2 OpenFormula / ODFF.

Changes made by the committer:
* Original submission added the new functions to the Logical group, that group
  has only functions though that return a logical value 1/0/true/false. ODFF
  groups them under "Bit operation functions" that currently is not available
  in Calc. Added the functions to the Mathematical group instead.
* Changed descriptions of functions in the Function Wizard.
* One sal_uInt64 constant instead of several identical literal 281474976710655
  values.
* Replaced 'or' operators with ||
* Don't push two return values, if PushIllegalArgument() was used don't use
  PushDouble() thereafter.
* Treat double values with ::rtl::math::approxFloor() to obtain integer
  values.
* For BITLSHIFT and BITRSHIFT implemented a different algorithm following the
  ODFF specification that allows larger shift values.
* Use our block braces style, respectively don't use block braces for one-line
  if-statements.
* Fixed indentation levels.
* Adapted RTL_LOGFILE_CONTEXT_AUTHOR to say "pechlaner". Credit to whom credit
  is due ;-)

allows to get rid of export of vtable

Factor out ABI-breaking changes to OPropertySetHelper into a derived
class OPropertySetHelper2.

Only gcc3.map is up-to-date.

This change improves import performance of Excel documents based on
the following changes.

1) Pool styles only once per call.

This removes SfxItemPoolCache instantiation and destruction which
is quite expensive.  This alone cuts import almost by half with
large documents with lots of styles applied.

2) Skip removal of direct formats when setting style.

The old code was iterating through all attribute regions in order
to try to remove overlapping format attributes when applying a
style.  But that's strictly not necessary (and bad for performance)
during import.  This also removes the need to re-apply the direct
formats right afterward.

3) Avoid creating a duplicate ScPatternAttr instance per XF.

There is simply no need to create a clone of the style only to put
it into the styles pool and get discarded.  This saves additional
few seconds.

Basically everything except pItemInfos is under pImp.  This will
make it easier for future refactoring in the implementation area.

The visibility configure test failed to clean up visibility.cxx.
This patch fixes that.

 * observed on gentoo tinderbox

the SC_DLLPUBLIC changes in document.hxx are only necessary until we can
link statically against sc