* Add using namespace std

[Zipitn]

• Add using namespace std
• Rename some functions (e.g. zip -> co_zip, meow -> co_upto)
• Add missing includes
• Other minor changes (see commit messages)

Originally posted by @JMazurkiewicz in microsoft/STL#4722

Originally posted by @Zipitn in Zipitn/shiny-system#1

from collections import Counter

counts = Counter()
counts1 = []
for row in data:
counts[row[IMPORT_COMMUNICATION]]