Functions in bracket expressions may now lazily evaluate their arguments.
ui:if and ui:ifvar may refer to any functions defined for bracket
expressions.
New: ui:ifexpr
Parsing of bracket expressions is now done with ulex. Private interfaces
of PXP are no longer used for this purpose.
Serialization has been rewritten, and it is now safe.
Fix: In ui:context there may now be macro references at any location.
Also documented all these changes.


git-svn-id: https://godirepo.camlcity.org/svn/wdialog/trunk@210 f54c9a64-0731-4a92-b797-30fd5898f27c