waf: readme: clarify explanation on program groups
The necessity for that was pointed out in the PR #3841 ("waf: readme: update information regarding groups" - https://github.com/ArduPilot/ardupilot/pull/3841).
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BUILD.md
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BUILD.md
@ -63,8 +63,10 @@ waf list
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## Program groups ##
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Program groups are used to represent a class of programs. They can be used to
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build all programs of a certain class without having to specify each program. A
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program can belong to more than one group.
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build all programs of a certain class without having to specify each program.
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It's possible for two groups to overlap, except when both groups are main
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groups. In other words, a program can belong to more than one group, but only
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to one main group.
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There's a special group, called "all", that comprises all programs.
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