Pretty printing of elliptic integrals
Replace duplicated code by dedicated function
Pretty printing of elliptic integrals
Replace duplicated code by dedicated function
Add tests for pretty printing of elliptic integrals
Don't use raw unicode character in _print_elliptic_pi()
Merge remote-tracking branch 'skirpichev/pr2164-test' into elliptic_print

Conflicts:
	sympy/printing/pretty/pretty.py
Change pretty printing of elliptic_pi function.
Implement Karr definition for summations with reversed limits (issue 3175)
Merge pull request #2164 from raoulb/elliptic_print

Pretty printing of elliptic integrals
Add elliptic integrals E and K to the Meijer-G tables
Manually tuned expansion bases for K(z) and E(z)
Merge pull request #2165 from raoulb/elliptic_meijerg

Add elliptic integrals E and K to the Meijer-G tables
Merge pull request #2202 from skirpichev/3175-karr-sum

Implement Karr definition for summations with reversed limits (issue 3175)
Test for the Karr summation convention
Merge pull request #2203 from raoulb/test_karr_convention

Test for the Karr summation convention
Added WIP frame file
Added functions map_variables, removed __new__
Coded initialiser and time_derivative methods
Added auxiliary functions file, added convert_pos_vector function