ncurses 5.7 - patch 20090718

+ fix a null-pointer check in _nc_format_slks() in lib_slk.c, from
  20070704 changes.
+ modify _nc_find_type_entry() to use hashing.
+ make CCHARW_MAX value configurable, noting that changing this would
  change the size of cchar_t, and would be ABI-incompatible.
+ modify test-programs, e.g,.  test/view.c, to address subtle
  differences between Tru64/Solaris and HPUX/AIX getcchar() return
  values.
+ modify length returned by getcchar() to count the trailing null
  which is documented in X/Open (cf: 20020427).
+ fixes for test programs to build/work on HPUX and AIX, etc.