[PATCH] shell script error management in ash (ready for integration)

[Roberto A. Foglietta]

Hi Denis,

 supported by the experience of Harald, I developed this patch far enough
to be ready for integration. These are the features that will add to
busybox ash:

 - trap ERR and set -E added
 - global FUNCNAME added
 - LINENO became global

 The patch is in attachment with its test suite. Both could be also
retrieved at this link

 https://github.com/robang74/tinycore-editor/tree/main/busybox/patches
 busybox-1.33.1-error-management-extension-for-ash-v019.patch

 https://github.com/robang74/tinycore-editor/tree/main/busybox/tests

 Best regards,
-- 
Roberto A. Foglietta
+39.349.33.30.697
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