Merge branch 'ticket/13441' into ticket/13626
Merge branch 'ticket/13628' into ticket/13627
Trac #13627: implemented xgcd for padics
Merge branch 'develop' into ticket/13627

Conflicts:
	src/sage/rings/padics/padic_generic_element.pyx
minor changes in documentation for xgcd of p-adics
xgcd for p-adics if one of the parameters is zero
Some minor formatting review tweaks for #13627.
minor LaTeX fix xgcd docstring
15057: Adding SymPy conversions, with reviewer's additions
15057: fix typo
Merge branch 'u/saraedum/ticket/13627' of trac.sagemath.org:sage into u/tscrim/13627

Conflicts:
	src/sage/rings/padics/padic_generic_element.pyx
Trac #15057: SymPy conversions for symbolic functions that are missing them

Some symbolic functions are missing SymPy conversions.

URL: http://trac.sagemath.org/15057
Reported by: eviatarbach
Ticket author(s): Eviatar Bach
Reviewer(s): Ralf Stephan
Trac #13627: implement xgcd for padics

Currently, there is no xgcd for padic numbers:
{{{
sage: R = Zp(3)
sage: R.one().xgcd(R.zero())
AttributeError: 'sage.rings.padics.padic_capped_relative_element.pAdicCa
ppedRelativeElement' object has no attribute 'xgcd'
}}}

The attached patch implements it.

URL: http://trac.sagemath.org/13627
Reported by: saraedum
Ticket author(s): Julian Rueth
Reviewer(s): Travis Scrimshaw