configs/nucleus2g:  Remove this board from the configs/ directory.  A snapshot is still available in the Obsoleted repository

Signals:  Correct implementation of sigset().  It is not just signal() with a different name; it has some additional signal mask handling functionality

Optional canned symtab inclusion to the build. When option CONFIG_LIBC_SYMTAB is selected and symbol table file libc/symtab/canned_symtab.inc is prepared then application can use system provided complete symbol table. The option has substantial effect on system image size. Mainly code/text. If loading of applications at runtime is not planned do not select this.  From Pavel Pisa.

Add support for a union file system that can be used to overlay and merge the content of two mounted file systems.