- Update to version 2.3:
* Ready for release: v2.3
* update copyright dates to 2018
* iucode_tool(8): document changes to ucode filtering
* iucode_tool: support selecting by ucode revision
* iucode_tool: add function to parse signed 32-bit integers
* iucode_tool: optimize detection of base10 numeric names
* iucode_tool: better handle offline/non-continuous topology
* iucode_tool(8): document changes to --scan-system
* iucode_tool: select scan-system strategy change at runtime
* gitignore: rearrange, and ignore backup and vim swap files
* iucode_tool: move scan_system_processor() one layer down
* iucode_tool: do not scan-system while parsing
* iucode_tool: add two command-line parser helpers
* intel_microcode.h: document intel_ucode_status_t sources