speakeasyR 0.1.2

Add

• Contributors of vendored software to DESCRIPTION.
• Support for external ARPACK

Changed

• Use autoconf to generate configure file in order to detect system packages and support for pthreads.
• Remove support for compiling internal linear algebra packages and no longer ship source code for those packages.

Fixed

• Prevent unused igraph vendored packages from being shipped in the source tarball.
• Update SE2 C library to fix address sanitizer errors.