Merge branch 'release-1.6' of https://github.com/Macaulay2/M2
using the install target "install-bin-sta" for library "pari" was a mistake,
as it distributes the stand-alone program 'gp' to users!  So we remove it.
Under Mac OS X, arrange to distribute needed dynamic libraries, in Macaulay2-1.6/lib/, which will
be installed as /Applications/Macaulay2-1.6/lib/.

(If we use a self-installed version of gcc to build M2, then it depends on libgcc_s.1.dylib and libstdc++.6.dylib.)

Now we must tell the M2 executable file to look in /Applications/Macaulay2-1.6/lib/.
insist on the right prefix for Mac OS X if --enable-dmg is given to "configure"

and fix a misprint
fix program lrslib makefile so it uses the standard build options
fix nauty makefile so it obeys LDFLAGS
run otool after linking M2; add dynamic library search paths to M2 executable
when making a dmg file: give an error if any binaries to be distributed depend on non-system dynamic libraries
clarify the use of static linking options when using a non-standard gcc
my Makefile.mac: use gcc static linking options under Mac OS X
change a comment
merge
Fix library "ntl" configure script so it :

    - works in a batch environment
    - doesn't object to variable values that contain "-h" within
Improved Mac OS X distribution mechanism, that accounts
for non-system dynamic libraries that should be distributed.
start working on native Windows port using mingw-w64
mingw port: add libxml2 instructions
mingw port: add libxml2 include dir
porting mingw: my makefile
add a pseudo-library "missing" to provide missing unix functions, such as sync()
arrange for gdbm to link with libmissing, so under mingw it finds sync()