faster enable/disable of error option
c++ implementation for win32 quit hook
use tcl for file monitoring tree
viewData: simplify implementation and map to utils::View
simplify package_install_context and isLibraryWriteable
shellViewPdf: use Sys.info() for platform dispatching; correct/improve comments
correct exception handling behavior for clean up / save prompt
add comments and remove legacy 32MB constraint in setMemoryLimit; correct console buffer character type on windows
revert to 512mb virtual offset