makeinfo if no native makeinfo executable exists. Honor TEXINFO_REQD
when determining whether the native makeinfo can be used.
* Remove USE_MAKEINFO and replace it with USE_TOOLS+=makeinfo.
* Get rid of all the "split" argument deduction for makeinfo since
the PLIST module already handles varying numbers of split info files
correctly.
NOTE: Platforms that have "makeinfo" in the base system should check
that the makeinfo entries of pkgsrc/mk/tools.${OPSYS}.mk are
correct.
Home directory and environment variable expansion in the .mairixrc file.
Add ^ word prefix to require substring search to be left-anchored.
Add the capability to omit particular folders from indexing.
Implement dot-locking on the database file.
Display message path in warning messages from rfc822 parsing.