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make: reduce line length in error messages

The error messages for deeply nested parse errors were hard to decipher,
due to the large amount of text.  Split these messages into individual
lines, just as in the backtrace for .include files and .for loops.  This
unified backtrace makes the output more uniform.

make: in error messages for anonymous variables, log the value

Sync with HEAD.

make: add detailed exit status to message for failed sub-commands

Several commands communicate via the exit status and not only
distinguish between zero and non-zero, so make this information
available to ease investigations.

The command "false" is not guaranteed to exit with a consistent status,
so use "(exit 13)" instead in the tests, to keep these tests portable
across different operating systems.  The exit status 127 is required for
a shell that cannot find a command, so keep that one.

make: add more context to "returned non-zero status" message

Previously, this message was an "error" but had no influence on the exit
status, so make it a warning instead.  In the seldom used -W mode that
treats warnings as errors, this change influences the exit status.

make: add debug logging for capturing the output of external commands

This applies to all 4 situations in which the output of an external
command is used for modifying a variable or an expression:

* the assignment operator '!='
* the assignment modifier '::!='
* the SUN shell modifier ':sh'
* the other shell modifier ':!cmd!'

Previously, only the shell modifier ':!cmd!' had debug logging.

Suggested by Christoph Badura.

make: add test for the variable modifier ':sh'

make(1): fix error message of failed :!cmd! modifier (since 2000-04-29)

make(1): document 20-year-old bug in the :!cmd! modifier

make(1): update and add comments in tests

As a result of the new comments, some line numbers have changed in the
output of the tests.  No other changes.

make(1): describe the purpose of each newly added unit test dummy

make(1): add dummies for fine-grained tests, one per single feature

The test names have been derived from the current manual page.

All these tests are dummies right now, and the code from the existing
tests will be moved into the new tests step by step.

This is done to prevent modmisc, escape, varmod-edge and varmisc from
growing without any bounds, and to reduce the side-effects of one test
to the others.