* Fixed a typo in a comment
* Refactored sig API following nist-branch (also fixes issue 380)
* Fixed Windows compilation error in sig.c.
* Added Picnic to Windows' config, and changed defaul alg to Picnic (since qTesla is not yet supported on Windows)
* Moved sig_picnic and sig_qtesla under sig directory, to harmonize with kem api
* Use different default sig alg on Windows to fix Travis back-compat tests and platform gap.
* Further changes required for OQS to be properly used by applications
* Compare OQS functions's return values to OQS error codes in sig.c.
* Fixed typos in comments.
* Replaced minimal_oqs_sig with example_sig.
* Ensure travis tests fail on error
* Add try-catch block in all-tests.sh
* Ignore example_sig
* Point global-namespace-check to .libs/liboqs.a
* More precise error handling in global-namespace-check
* Warning colours in travis tests and error handling in free-check
* Error handling in style-check
* Clean up style-check
* Removed leftover minimal_sig_oqs ref and VS projects.
* Prettyprint
* Revert clang-format version check
* Re-revert clang-format style check
* Prettyprint
* Added speed_sig to master.
* Removed superfluous extern from sig schemes .h
* Removed the OQS_RAND object from the sig API, to harmonize with the KEM API (issue 374)
* Updated sig API to match nist-branch's (except for the sign/open functions).
