fcm make: make log visible on top

Create symlinks to `.fcm-make/log`, `.fcm-make/config-as-parsed`
and `.fcm-make/config-on-success` at the root of the make.
fcm make: preprocess: support prop{*include-paths}
fcm make: preprocess: fix bad command in test
Merge pull request #54 from matthewrmshin/cpp-include-paths

fcm make: preprocess: support prop{*include-paths}
fcm-make.log: fix syntax and more tests
Merge pull request #53 from matthewrmshin/fcm-make.log

fcm make: make log visible on top
Merge branch 'master' into cxx