Remove compatibility stubs for old bundle op classes and document.

The compatibility stubs were not fully functional, so rather than
expend a lot of time fixing the stubs, we have done away with the old
names for the bundle ops.

Added documentation for this in the manual, as a new FAQ.

While indexing the class names, I found that we incorrectly used findex
for classes, instead of tindex.  Added syncodeindex so that we can use
the tindex command going forward without breaking everything.
Bump version to 3.1.3.1
Add input-string, a symmetric function to output-string.
uiop:getcwd wasn't doing what we wanted on LispWorks.
Move support for fasl-op and other legacy names for bundle operations to a contrib.
Bump version to 3.1.3.2