Overhaul functions in scripts/set directory. * set.txi: Rewrite documentation for set functions. * intersect.m: Rewrite docstring. Use by_rows variable for code clarity. Return output orientation which is compatible with Matlab. Add %!tests for output orientation and N-dimensional inputs. * setdiff.m: Rewrite docstring. Use by_rows variable for code clarity. Rename output i to ia to clarify it is an index into the set a. Return output orientation which is compatible with Matlab. Add %!tests for N-dimensional inputs. * setxor.m: Rewrite docstring. Use by_rows variable for code clarity. Return output orientation which is compatible with Matlab. Add %!tests for output orientation and N-dimensional inputs. * union.m: Rewrite docstring. Use by_rows variable for code clarity. Return output orientation which is compatible with Matlab. Add %!tests for output orientation and N-dimensional inputs. Add %!tests for validsetargs which are common to all set functions. * unique.m: Rewrite docstring. Verify that input is numeric or cell array of strings. Avoid computing idx for optional i,j outputs unless required. Add %!error tests for input validation. * ismember.m: Rewrite docstring. Use input variable 'a' instead of 'A' for conformance with rest of set functions. Rename output index variable to s_idx for clarity that it is an index into the set s. * powerset.m: Rewrite doctring. Add input validation on nargin. Add %!error input validation tests. * module.mk: Include validsetargs.m in build system. * validsetargs.m: Function renamed from validargs which was too general. * validargs.m: Function renamed to validsetargs.

FCN_FILE_DIRS += set

set_FCN_FILES = \
  set/intersect.m \
  set/ismember.m \
  set/powerset.m \
  set/setdiff.m \
  set/setxor.m \
  set/union.m \
  set/unique.m \
  set/private/validsetargs.m

FCN_FILES += $(set_FCN_FILES)

PKG_ADD_FILES += set/PKG_ADD

DIRSTAMP_FILES += set/$(octave_dirstamp)