minor bugfix and rename -- dashbox and bitfield

[Robin Fairbairns]

the package formerly known as dashdbox was found to suffer a minor
infelicity.  in the course of correcting the bug, the author (Reuben
Thomas) decided to change the name of the package to dashbox.

i have therefore deleted the previous
macros/latex/contrib/supported/dashdbox, and installed the new version
of the package in macros/latex/contrib/supported/dashbox

the dashbox package does \fbox(etc)-like things, with dashed borders

the bitfield package (macros/latex/contrib/supported/bitfield) has
also been upgraded, since it uses dashbox.

the bitfield package draws bitfield diagrams.

Robin Fairbairns

For the CTAN team