adjust DrRacket's online compilation to recognize exn:missing-module?
exceptions and offer to install
when the package installer has a parent, don't
recenter the dialog

(should this be mac os x specific?)
missed a spot for the vector => exn-info change

also update the commented type spec

this fixes a bug in commit 3474d091
minor clarification to class/c contract spec
minor improvement to class/c: generate a little bit less code
add GUI support for compile-enforce-module-constants to DrRacket

closes PR 13781
Fix broken internal error
Fix doc typo.
Allow the profiler's sampler to collect user-specified continuation marks.
Don't splice in vector creation when optimizing vector-length.

Closes PR13788.
Fix broken test.
Added some checks for user errors.
Removed some error-checks that can't happen.
Added a bunch of test cases.
Reorganized test cases to be after each function, rather than all in one place.
add a parameter to adjust random generation methods

- also remove an obsolete function and some other cleanups
Fix broken test, again.
Use submodules instead of marking tricks for identifiers in docs.
Register scoped type variables for internal def. annotations.

Closes PR 13793.
Make resolve actually do all the necessary resolutions.
Centralize the definition of the plambda syntax property.
Centralized typechecker:ignore properties.
Consolidate the rest of the syntax properties in TR.