Log Message:
Update ne to 3.15

Version 3.15 01-May-2018
------------------------

1. The "logo" line "NE version xxxx" was showing the PCRE \ 
version which was
current when NE was compiled (static) instead of getting the current (dynamic)
version from a shared library. This is now fixed and the line reformatted.

2. Minor error in command line decoding; for switch items such as -id it was
checking the text pointer (which might be partly unset) instead of the number
field.

3. There is now a maximum linelength that NE will handle when reading a file in
non-binary mode. The limit is 100,000 bytes. This prevents it going into a
meltdown memory thrashing state for a file that contains an excessively long
line.

Version 3.14 26-February-2018
-----------------------------

1. Two calls to error_moan() for failing to open a file were missing a second
argument (specifying reading or writing), leading to a crash for an unknown
file.

2. Added strerror() calls to all failed-do-open file errors.

3. Added some "fall through" comments when deliberately falling through.

4. Increased an internal buffer size to avoid format-overflow warning in "show
wordcount" command.

5. Implemented -notraps to disable catching crash signals. This makes crashes
easier to debug.