CONFIG: improve prefix matching for system libraries (#1607)
- missed detection of system libraries when installed with multiarch paths like /usr/lib/x86_64-linux-gnu CONFIG: improve handling of group/user config files (#928) - changed bashrc handling of FOAM_CONFIG_NOUSER to use FOAM_CONFIG_MODE instead. Propagate into foamEtcFile to make this a stickier control. This change allows better control, but also enables cluster installations to define their own value within the OpenFOAM prefs.sh file to prevent users accidentally mis-configuring things if necessary. - remove undocumented handling of an (a)ll mode in foamEtcFile to avoid potential pitfalls. - add support for FOAM_CONFIG_ETC handling. This allows injection of an extra search layer when finding project etc files ENH: improvements to foamConfigurePaths (#928) - handle FOAM_CONFIG_ETC implicitly, or explicitly with the new -etc option. STYLE: more explicit wording in foamConfigurePaths usage (#1602) - document that an absolute path (eg, -scotch-path) overrides/ignores the equivalent ThirdParty setting (eg, -scotch) - longer options -system-compiler and -third-compiler for -system and -third, respectively. Clearer as to their purpose. - adjust the location sanity check to look for META-INFO directory.
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