[MONDRIAN-1943] improvements to native count.  Better support for nonempty
and empty contexts, added unit tests, verified support for AllMember and
Children.
Added IsError Function and tests
Merge pull request #20 from tgf/evergreen

+mondrian.xmla.FullHierarchyNames: include hierarchy name even if =dimen...
Added temporary predicate behavior to allow NonEmpty to behave with a
certain type of dummy calculated members that only have one actual
predicate value in the database.
Merge branch 'evergreen' of https://github.com/wgorman/mondrian into evergreen
Merge pull request #21 from tgf/evergreen

[MONDRIAN-1968] Support cube name as third argument for Exists
Added support for XMLA Tabular Cell Properties
Merge branch 'evergreen' of https://github.com/wgorman/mondrian into evergreen
Merge pull request #19 from portisheadaff/evergreen

Added IsError Function and tests
[MONDRIAN-1933] allow subset to work against virtual cubes
general fixes for native evaluation, enable virtual cube native eval for
certain use cases, fixed native eval count bug, added broader support for
calculated members in the filter(,count()) scenario.  Still need to create
unit tests to highlight native evaluation with virtual cubes.
update vertica dialect to issue separate distinct count queries, due to
performance issues with vertica
added large dim check in AggregateFunDef to avoid "optimization" against
very large dimensions.
[MONDRIAN-1972] fixed issue related to native evaluation and [(All)] Level
references.
[MONDRIAN-1977] Add a new Dialect property that issues all count(distinct
measures separately from the remaining aggregations
[MONDRIAN-1995] backport of hanger dimension functionality from Mondrian
4.0.  Due to the complexity of cube initialization, we couldn't do a full
backport.  Hanger dimensions must have either a dummy dimension table to
define a default member, or include an all member.
Updated trace to make it easier to link to other log lines.
[MONDRIAN-1995] fixed issue with hanger dims that specify dummy dim table.
[MONDRIAN-1995] fixed Main test suite issue
removing temporary predicate work around, scenario is now supported and
validated against hanger dimensions