0.11

* new type zip_flags_t

All old flags fit; you need to adapt if you were saving flags in a
local variable. Use zip_flags_t for such a variable.

* integer type size changes

Some return values were not the right size or sign.

** zip_name_locate()
Return value was int, which can be too small. Now returns zip_int64_t.


TO DOCUMENT:
  . _set_name allows NULL (document)
  . old extra fields API removed
  . change in return value of get_comment: NULL if error, else pointer to empty array and len=0
  . document ZIP_DISABLE_DEPRECATED (libzip man page)
  . renames of zip_add, zip_rename, zip_replace, zip_add_dir, zip_{set,get}_file_comment
  . NULL is now allowed for file names (zip_add, zip_add_dir, zip_rename)