remove obsoleted stuff in power.py
Add logx defaults
Merge pull request #2541 from certik/HeinerKirchhoffer-fix-root-isolation-bounds

Heiner kirchhoffer fix root isolation bounds
Added until test_X22()
Merge pull request #2490 from toolforger/contextualize-ga-printing

Made GA_Printer robust against exception abort
Merge pull request #2507 from asmeurer/rbool

Define all the __rop__ logical operators on Boolean
Merge pull request #2512 from asmeurer/rcall-Basic

Move rcall from Expr to Basic
Merge branch 'master' into logx-for-lseries
Merge branch 'master' into 3741-nargs-as-tuple
Implement nargs canonicalization in the FunctionClass metaclass
Test nargs canonicalization
Merge pull request #2542 from asmeurer/traversal_argset

Use _argset in preorder_traversal
Don't print a space after ¬ in the pprint of Not
4046: raise error if abs is not removed in solve

A better alternative is to have a method to rewrite Abs
as Piecewise which could then be solved. (see issue 4046)
Merge pull request #2540 from smichr/4046

solve with Abs and checksol issues
Merge pull request #2549 from asmeurer/Not_pprint

Don't print a space after ¬ in the pprint of Not
Merge pull request #2539 from smichr/4023

4023: better handling of exponents in nfloat
Merge pull request #2517 from amitsaha/cleanup_temp

test_plot.py: Cleanup temporary files after test completion
Add Amit Saha to AUTHORS/aboutus. Welcome to SymPy!
Merge pull request #2550 from smichr/auth

Add Amit Saha to AUTHORS/aboutus. Welcome to SymPy!