Merge branch 'maint'
runtime: forgot to go back to the 'old' style using gruel.
runtime: fix for thread safety issue during simultaneous use of stream tags and performance counters
build: removed some old autotools-related documentation.
runtime: id docstring clearer
docs: fixed warnings.
runtime: changed remove_item_tag to only mark tags as deleted
build: only ever include "config.h" in source (.cc) files.
docs: updating Doxygen categories for all blocks.
Block categories in Doxygen now match where they are in GRC's category tree.
Also available in: