Modified: SPHINX DOCUMENTATION.
Implement known values of Si, Ci, Shi, Chi at oo and -oo
Tests for values of Si, Ci, Shi, Chi at oo and -oo
Replace 0 by S.Zero
Modified the documentation to pass tests.
Minor edits.
Minor edits
Edits again.
More minor edits.
check_assumptions(): handle only bool values.

Assumption dicts only have values in {True, False, None}, so
there is no reason to complicate the code by special-casing
anything else.
check_assumptions(): Don't use new-style assumptions.

There is no guaranteed correspondence between old and new
assumptions with the same name.
Fix RootOf assumptions.

Fixes issue 3551.
Backticks added.
Update doc/README.rst
Update doc/Makefile

Use foreach instead of  a bash for loop, thus stopping on the first error.
tutorial: formatting only.
tutorial: Update link to extended installation instructions.
Update tutorial.pot
Update tutorial.??.po
Update tutorial.zh.po