Improve handling of poor address matches at the civicNumber, block, and street matchPrecision levels

[mraross]

Match score range is really three ranges, one for each of civic, street, and locality match precision as follows:

Match confidence	CivicNumber matchPrecision	Street matchPrecision	Locality matchPrecision
High	90-100	72-78	58-68
Medium	80-89	69-71	48-57
Low	0-79	0-68	0-47
Low confidence penalty	32	10	0

matchPrecisions site, block, and unit can all be considered equivalent to civicNumber for this analysis. A low confidence match is given an extra penalty so that a high confidence locality match will be ranked higher. Low confidence penalty = matchPrecisionScore - locality.matchPrecisionScore

Here are the match scores for 6207 Centre St Salmo BC adjusted using the low confidence penalty:

Address	Score	After low confidence penalty	Match Precision
Cemetery Rd, Salmo, BC	72	72	Street
Salmo St, Kimberley, BC	64	54	Street
6207 Salmon Valley Rd, Salmon Valley, BC	74	42	Block
6207 Centre Rd, Niskonlith Lake, BC	58	26	Block
6207 Central Rd, Hornby Island, BC	56	24	Block

Without the low confidence penalty, 6207 Salmon Valley Rd, Salmon Valley is the best match. With the low confidence penalty, Cemetery Rd, Salmo becomes the best match and the only match in the correct locality.

[mraross]

Here are the match scores for 110 Main St Kaslo, BC adjusted using the low confidence penalty:

Address	Score	After low confidence penalty	Match Precision
Main St, Lardeau, BC	73	73	Street
Main St, Slocan, BC	73	73	Street
Rain Bow Dr, Kaslo, BC	71	71	Street
110 Main St, Yahk, BC	58	26	Block
110 Main St, Ahousaht, BC	58	26	Block

Low confidence penalties have no effect on the ranking of matches. This is ok because there is no Main St in Kaslo and both Lardeau and Slocan are neighbours of Kaslo.

[mraross]

Here are the match scores for 627 ABERDEEN RD. MERRITT adjusted using the low confidence penalty:

Address	Score	After low confidence penalty	Match Precision
Merritt, BC	55	55	Locality
627 Aberdeen Dr, Parksville, BC	57	25	Block
627 Aberdeen Dr, Kamloops, BC	57	25	Block

This is a good example of locality hopping. Both civic address matches end up below Merritt thanks to the low confidence penalty.

[mraross]

Here are the match scores for 990 Bob Lane, North Saanich, Port Alberni adjusted using the low confidence penalty:

Address	Score	After low confidence penalty	Match Precision
Port Alberni, BC	55	55	Locality
990 Bob Lane, North Saanich, BC	63	32	Block
Bob-O-Link Way, Nanaimo, BC	59	49	Street

For this address, Port Alberni bubbles to the top but 990 Bob Lane, North Saanich looks like a better match.