Better diff mode (DIFFABLE=1)

[wilzbach]

Follow-up to dlang/tools#222 and #1537

Btw as this could also lead to unrelated diffs, should we disable the Bugzilla query for bugs for the changelog builder in "nightly mode"?

Hmm, yeah, changes that shouldn't result in documentation changes should not have documentation changes indicated in the status line, because then inadvertent documentation changes will get through. I guess with this and #1537 we should expand NODATETIME to something more generic.

[wilzbach]

Apparently that's the "workaround" to inject parameters into the layout file - it's also the prevalent style here (see above).

[CyberShadow]

[2017-02-27 09:13:16.384055] Running: 'make' '-f' 'posix.mak' 'DIFFABLE=1' 'all' 'kindle' 'pdf' 'verbatim'

Seems to be working from my side :)

[CyberShadow]

Relevant change: CyberShadow/ae@a313457

[CyberShadow]

Why the broken "Previous version.html" link? Will that be resolved by dlang/tools#222?

[wilzbach]

Why the broken "Previous version.html" link? Will that be resolved by dlang/tools#222?

Good catch!
It's due to the changed.d trying to detect the previous version based on the git revision pattern, which isn't passed anymore. Luckily there's the --prev-version flag (fixed).