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When a process name changes from a long string to a short string,
truncate instead of just overwriting the beginning.

Closes #785.

As noted by @marcelpaulo. I've had ugly diffs that fiddled with
this file in the past, so it's good to see it gone.

Closes #800.

This was reported by @agguser.

This would prevent a careless future package maintainer from creating a
release tarball with a defective configure script. :)

Also, add a warning in the autogen.sh phase if pkg.m4 is unused.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>

This broke with commit db05ba61.

With this commit:

* if pkgconfig is installed, it will expand the code inside the shell if, adding the pkgconfig-based tests for the dependencies of Linux delay accounting.
* if pkgconfig is not installed, it will add an error message inside the test of Linux delay accounting, telling the user to install pkgconfig and rebuild the configure script if they want to use Linux delay accounting.

The end result is:

* people running Linux
  * will not need pkgconfig when not using delay accounting
  * will need pkgconfig when using delay accounting
    * if they don't have it
      * they are told by configure they need to install it and re-run autogen.sh when running from Git
      * they are told by configure they need to install it and re-run configure when running from the tarball
* people not running Linux
  * will never need pkgconfig

...and in none of the above scenarios the generated configure script produces unexpanded macros for users checking out the sources from Git.

Header creation fails with non-utf8 locale and python3.
Simply set LC_ALL="C" and use python3 to reproduce the issue.

env LC_ALL="C" ./scripts/MakeHeader.py MetersPanel.c
Traceback (most recent call last):
  File "./scripts/MakeHeader.py", line 32, in <module>
    for line in file.readlines():
  File "/usr/lib64/python3.5/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 956: ordinal not in range(128)

This changes is python2 and python3 compatible

cStringIO.StringIO module is removed because it is not able to accept unicode strings
https://docs.python.org/2/library/stringio.html#cStringIO.StringIO

Squashed the following commits:

* Solaris: Get LWP enumeration working
* Solaris: Make showing and hiding of kernel threads behave
* Solaris: remove usage of lwpstatus that is no longer needed
* Solaris: no discrete access to parent proc structure needed
* Solaris: Restore runtime MaxPid detection after LWP changes
* Solaris: Workaround virtual PID signal issue by shadowing kill() with a macro
* Solaris: Fix unintention double-shifting of virtual PID for LWP enumeration
* Solaris: Add LWPID to default display since LWP enumeration is also default
* Solaris: use PAGE_SIZE_KB from Process.h instead of custom definition
* Solaris: stop LWP enumeration at 1023 LWPs per proc since that is all we can handle in the virtual PID

Signed-off-by: Hisham Muhammad <hisham@gobolinux.org>

Keep scanning threads for versions before High Sierra 13.0.0 and after 13.3.0.