Update to 1.77

Upstream changes:
The version 1.71

1.  Fixed the REAL*8 and INTEGER*4 occurences in accordance with Kurt's email.

The version 1.73

1.  changed occurences of unix.time to system.time in accordance with Kurt's
directive.

The version 1.74

1.  One more unix -> system

The version 1.75

1.  package -> PACKAGE [per Kurt's email of 3/2/17]

The version 1.76

1.  Used package_native_routine_registration_skeleton  to remove
    PACKAGE = SparseM  [per Kurt's email of 3/2/17]

The version 1.77

1.  Changed setMethod for diag (matrix.csr) in accordance with MM's suggestion

2.  removed setGeneric for image also suggested by MM.

(wen)