RFR: Add tabfiles to jcheck configuration

[Magnus Ihse Bursie]

On Thu, 29 Oct 2020 10:56:25 GMT, Erik Helin <ehelin at openjdk.org> wrote:

>> The tabfiles setting is just like the files setting, but it lists files in which tabs are allowed.
>> 
>> (This is to support makefiles)
>
> How about naming the configuration `ignore-tabs` instead? To make it a bit more clear what it does :)

@edvbld 
> How about naming the configuration `ignore-tabs` instead? To make it a bit more clear what it does :)

Sure. I checked for "prior art" on multiword keywords, but did not find any such instances. :) This will mean that the corresponding Java variable needs a different name, since "-" is not valid in Java identifiers.

(And if we're going this way, personally I think `allow-tabs` would be even better)

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PR: https://git.openjdk.java.net/skara/pull/929