Serialbox version 2.6.0

New feature: data_kbuff directive

Adds the possibility to serialize data inside a k-blocked region of code. It buffers data(:,:,k) for each k-iteration and serializes data(:,:,:) out once a field is completely filled.
New !$ser data_kbuff k_value=k k_size=nz name=field(:,:) that can be used as a drop-in replacement of !$ser data name=field(:,:,:) but within a k-loop.

Bug fixes

• Reverted libnames to v2.4 style: In v2.5.x the libraries had a Shared and Static suffix by mistake. If your setup relies on the exact names (i.e. you are not using the targets exported by CMake), you need to update to the new library names.

Infrastructure

• Moved from travis to github actions
• Converted all line endings to unix-style