Radix conversions

• base2dec — convert from base b to decimal
• bin2dec — convert from binary to decimal
• dec2base — Convert decimal to base N number in string
• dec2bin — convert from decimal to binary
• dec2hex — convert from decimal to hexadecimal
• dec2oct — convert from decimal to octal
• hex2dec — convert from hexadecimal to decimal
• oct2dec — convert from octal to decimal