minor changes to Helper and pretty
Merge branch 'develop' of https://github.com/Sable/mclab into develop
Use sane FileEnvironment for kind analysis in XML
Revert "Simplify logic in XML generator."

This (partially) reverts commit f110e5bfd9048850d169343024d7ac6a0ff31c56.
Turns out all this null-checking is necessary, probably because of bugs
in FlowSensitive and FlowInsensitive kind analyses...
Suppress kind analysis stderr output.

The kind analyses are full of duplicate code and bugs also. They should
be totally refactored.
Fallback to LookupFile for XML kind analysis env.

LookupFile uses a big list of builtins, and the Tamer's BuiltinQuery
doesn't cover all of them.
merge from develop