B.2.1.5 Base

bases	Count number of bases
	`nbases:I=`bases`()`
	$\rightarrow$ The 'nbases' attribute has the same contents.
baseread	Get infos about a given base
	`(base-idx:I,base-name:S,cell-dim:I,phys-dim:I)=`baseread`(base-idx:I)`
	$\rightarrow$ Arg is base id, returns a tuple with base information.
basewrite	Create a new base in an existing CGNS file
	`base-idx:I=`basewrite`(base-name:S,cell-dim:I,phys-dim:I)`
	$\rightarrow$ Args are base name, cell and physical dimensions.Returns the new id of the created base