History of releases and changes in lbc

* lbc-104	2026-10-02
- fixed bc version number in lbc.c
- simplified src/config.h, src/number.c
- updated src/README

* lbc-103	2026-09-27
- use highest natural precision in bc
- fixed handling of sci notation
- added optional precision in a few functions
- new functions isinteger, isnegative, tointeger
- removed functions abs and __mod
- updated README

* lbc-102	2025-05-26
- use bc 1.08.2

* lbc-101	2019-06-30
- fixed typo in README

* lbc-100	2018-07-29
- first release
- use bc 1.07.1

