Decouple PCAP parsing and processing

[mnuzen]

• split the extraction of raw PCAP attributes from the removal of duplicates, calculation of frequencies, etc.
• look into storing frequencies in a separate entity (see #23 conversations)

[mnuzen]

• fixed frequency visualization: obfuscated and non-obfuscated options in buttons
• limited number of nodes on graph to most frequently connected addresses
• depicting frequencies in relative, normalized terms (i.e. so 2k connections won't show on visualization)