Consistently use the C++ names for headers rather than a combination of the
C and C++ names.
Remove empty LAGI_PRE blocks.
Remove checks for both AGI_PRE and LAGI_PRE and change a check for only
AGI_PRE to LAGI_PRE.
Originally committed to SVN as r5516.
Remove cajun includes from all public headers and the precompiled header
Add a pile of missing standard library headers used in multiple files
to lagi_pre
Originally committed to SVN as r5452.
