Change `lnorm` to `norm` and follow conventions from `norm` base function

[a-torgovitsky]

Also, be permissive on what the user is allowed to pass to specify the different norms. For example, with the 1-norm, a reasonable user might pass 1 (a number) "1" (a string) "one" "O" "o"

[conroylau]

Done! Changed lnorm to norm.

In addition, I have expanded the list of norms that users can pass to the norm.

For the 1-norm, users may pass

• "1" (string)
• 1 (number)
• "o"
• "one"
• "l1"
• "taxicab"

For the 1-norm, users may pass

• "2" (string)
• 2 (number)
• "t"
• "two"
• "l2"
• "e"
• "euclidean"

I will convert the string to lower case so whether they capitalize all or part of the string shouldn't matter.

[a-torgovitsky]

Please close when complete