Ease the transition between C standards

With this post I will start to discuss a series of modifications of the C standard that I have (or will) propose for C2x. As a starting point there is the observation that the passage from one C standard to the next  was not easy in the past. This, neither for implementers of C compilers nor for users, because it was not easy to capture partial improvements. Basically for gcc, e.g., you had to add -std=c11 or similar, and then test for the version number to see if a particular feature is implemented. This task then was even more complicated because some of the new features are language, and some are library.

This was tedious and error prone, and I think we should avoid such difficulties in the future.

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