fix namespace and version string
fix version string to comply with PEP 440
revised and cleaner setup script
typo fix
apply same name factorization as in setup.py
bump version
Merge branch 'enhancement/version' into develop

Conflicts:
	pynfft/_version.py
update tests for precomputation flag
add support for precomputation flag
modify __cinit__ with new design
adapt new design to rest of the class body
adapt tests to new api
various typo and api fixes
fix documentation in accordance to new api
connect python arrays with plan pointers at init
typo fix in doc
doc update
modify solver to match new nfft api
update autogen file
add tests for overriding arrays in all transforms