add hasVariable function to GenericIO

See merge request !9

remove rebalance_sourceranks function

See merge request !10

(was added 2 years ago and did not turn out to be useful.
Also causing problems on some compilers, eg on theta)

change default genericio file partitions

See merge request !8

added initial VELOC support

See merge request !6

Safe-Guards preventing segfaults for incorrect inputs (python interface)

See merge request !5

throw an error for missing variables and multiple-defined
 variables if variables are passed to the reader interface

explicitly define the stride for numpy arrays

Updated Docs, New default for python module

See merge request !4

allow reading single source rank in py module

add more class methods to py interface, whitespace

non-MPI version for (new) Python interface (only affects new_python)

See merge request !3

allows suprressing the "Read [...] variables ... " stdout logs