Fix latex subscript, etc use in ode.py lines 3671-2

Fixes #7417
Made some edits of latex and edited desription of ode_1st_power_series doc

More Fixes for #7417
Whitespace removed in ode.py
Fix too long line.

On line 2782 in ode.py there was a too long line. I separated the line into two
Fixed the subscripting for x_{0}.
Fixed need for :math: in 5386
Removed mention of accidentally included file.
changed x0 to x_{0}
Merge pull request #7530 from comer/Fix_LaTeX_ODE_doc_for_7417

Fix la te x ode doc for 7417
Fix 7564: Matrices created from 1D ndarrays are in column form.

This now matches the behaviour of matrices created from 1D lists.
fixed a small typo
Merge pull request #7589 from Tempel/7564_matrix_ndarray

Fix #7564: Matrices created from 1D ndarrays are in column form.
Merge pull request #7590 from kaushik94/smallTypo

Fixed a small typo
Support for len() for a ProductSet
Merge pull request #7572 from amitsaha/productset_length

Support for len() for a ProductSet
Order for point's != 0 or oo
Some tests for point != 0 and oo
Alter subs for Order with point != 0 or oo
Fix docstring of Order class
Right series() for x0!=0