epsnear: shorthand for iswithintol(…,eps*1e2).  And the name is shorter

Signed-off-by: Mark Histed <mhisted@gmail.com>
frm_findrownum: error message tweaks

Signed-off-by: Mark Histed <mhisted@gmail.com>
Add default directories.m (so clipclip.m e.g. can be used out of the box)

Signed-off-by: Mark Histed <mhisted@gmail.com>