Remove expired ports:
2018-03-01 devel/dotconf++: No upstream, not depend on in the ports tree
2018-03-01 emulators/gnuboy: Latest version is 1.0.5, older version does not fetch
2018-03-01 games/adgali: Mastersite disappeared
2018-03-01 games/tuxpuck: Mastersite disappeared
2018-03-01 japanese/migemo-emacs: Unmaintained
2018-03-01 math/clarence: Mastersite disappeared
2018-03-01 devel/cstringbuffer: Abandonware, no more upstream
2018-03-01 deskutils/charmap: Mastersite disappeared
2018-03-01 devel/afay: Abandonware, not used in the ports tree
2018-03-01 devel/alabastra: Abandonware, not used in the ports tree
2018-03-01 devel/adime: Abandonware, not used in the ports tree
2018-03-01 devel/boaconstructor: Abandonware, does not work with recent python/wxPython
2018-03-01 audio/amp: No more upstream
2018-03-01 devel/alf: Abandonware, unused in the ports tree