Patch release that fixes problems with library symlinks and pkg-config, as well as miscellaneous bugs/security issues.

• 1064 Use CMAKE_INSTALL_FULL_LIBDIR/INCLUDEDIR in pkgconfig for 3.*
• 1051 Fix non-versioned library symlinks in debug build.
• 1050 Use CMAKE__POSTFIX for .pc file lib suffix.
• 1045 The vtable for TiledRgbaInputFile was not properly tagged as export
• 1038 fix/extend part number validation in MultiPart methods
• 1037 verify data size in deepscanlines with NO_COMPRESSION
• 1036 detect buffer overflows in RleUncompress
• The Imath auto-build version defaults to Imath v3.0.5.