Changes

• Remove offensive cows "telebears" and "satanic", sending to cows-offensive. (#46)
• Improve Makefile, bringing more in line with GNU conventions, improve configurability, fix some make uninstall problems, etc. (#26) (Thanks, Hans Niedermann!)
• Remove leftover "Listing cowfiles in pretty format" debugging output (#50)
• Fix "uninitialized value $tail" error in cowsay -l output for empty (zero-cowfile) cow dirs (#50)
• Fix installation location ("prefix") detection for cases like user-defined symlinks, and align repo layout with installation prefix dir layout (#49, #55)
• Remove broken .pm cows (#54)
  • Support for the .pm cowfile format never got implemented. This keeps non-working cows from appearing in the cowsay -l list and the like.
• Expand cowsay --help screen, and the man page a bit

Internal changes

• Reorganize the repo to better match installation layout, and support running in-repo using $PATH.
• Remove some special-casing code for the in-repo execution mode.