add exercise on seraching restriction enzymes in dna
 simplify exercise on seraching restriction enzyme site in dna
set version to 1.0
add exercises with solutions
Merge branch 'master' of https://github.com/bneron/E2I2B.python.solutions

Conflicts:
	source/Collection_Data_Types.rst
	source/Control_Flow_Statements.rst
remove sectnum directive as tey are replace by numbered in index.rst