Generate doc/man/isympy.1 from the isympy.xml source
Merge pull request #7269 from skirpichev/generate-man

Generate doc/man/isympy.1 from the isympy.xml source
whitespace and similar changes
7594: factor(sqrt(x**2)) != x

logic in factor allowed sqrt(x**2) to become x. This has now been removed.
This breaks some trig manual_integrate results that are fixed in the next
commit.

In keeping with similar simplifications that are made to
spherical harmonic functions (sqrt(sin(theta)**2) -> sin(theta) because
of the assumed range of theta which makes sin(theta) positive), the
pattern sqrt(1-cos(theta)**2) is replaced with the simpler sin(theta),
too.
Impose domain restrictions in trig sub integrals
capitalize riemann in docstrings
Merge pull request #7640 from smichr/reimann

capitalize reimann in docstrings
Merge pull request #7637 from smichr/7594

fixes #7594
watch for improper separation of base and exp in powsimp

e.g. sqrt(x**a) should not be split as x**a, 1/2 otherwise
it will rejoin as x**(a/2) later -- this is noted with an
inline comment.