libpressio version 0.55.0

libpressio version 0.55.0

Major Changes

• launch modules are now user extendable with the
  libpressio_ext/launch/external_launch.h header this will allow
  users to provide their own process launching mechanisms where
  traditional methods are blocked/disallowed.
• Support for remote metrics servers which use a JSON protocol was
  added. This enables servers that use MPI to be nested beneath MPI and
  allows for metrics servers that have long startup times to remain
  running and respond to multiple metrics requests. The protocol format
  is still unstable and may change.
• New meta-IO module called copy_template which copies a template from
  another file before dispatching to another IO module for writing.
  This enables users to copy most of an HDF5 file and overwrite only a
  portion of it when using it with external metrics.
• POSSIBLE BREAKING CHANGE, external:command is now a write only
  setting. If the module supports it, the corresponding option is now
  external:commands which is a std::vectorstd::string. The old name
  sets this new parameter by splitting on spaces.
• the external metrics module gained the ability to choose to intercept
  pressio_compressor_compress_many or pressio_compressor_compress via
  external:use_many
• New higher level python interface libpressio.py It's interface is
  also unstable and may change frequently.

Minor Changes

• Support for newer versions of mgard which use mgard::mgard_library as
  the cmake target

Bug Fixes

• fixed some static analysis warnings in the test cases.