v1.4

• Update libmseed to 2.19.3, adjust counters to 64-bit.
• Remove dependency on ntwin32.mak for Windows nmake makefiles, now building works in plain MSVC development environments.
• Add DEPRECATED notice to Makefile.wat and src/Makefile.wat.
• Clean old targets out of src/Makefile.
• Update licensing to GNU GPL 3.