Normalize officer titles

[waldoj]

Here are the 50 most frequently-used titles in 5_officers:

title	uses	frequency
PRESIDENT	179760	27.97%
VICE PRESIDENT	89793	13.97%
SECRETARY	62740	9.76%
TREASURER	45240	7.04%
OFFICER	16614	2.58%
S/T	14997	2.33%
DIRECTOR	13669	2.13%
SEC/TREAS	9042	1.41%
CEO	8694	1.35%
P/S/T	8680	1.35%
ASST SECRETARY	7371	1.15%
P/T	6128	0.95%
CHAIRMAN	5816	0.90%
VP/S	5806	0.90%
CFO	4798	0.75%
P/S	4664	0.73%
PRES/DIR	3960	0.62%
PRES/TREAS	3817	0.59%
P/CEO	3553	0.55%
VP/SEC	3364	0.52%
PRES/SEC/TREAS	3348	0.52%
VP/T	2771	0.43%
PRES/SEC	2545	0.40%
PRES/CEO	2542	0.40%
ASST TREASURER	2401	0.37%
SR VP	2104	0.33%
VP/S/T	1855	0.29%
EXEC VP	1838	0.29%
COO	1725	0.27%
VICE CHAIRMAN	1692	0.26%
DIR/PRES	1635	0.25%
ASST SEC	1609	0.25%
VP/TREAS	1436	0.22%
P/D	1331	0.21%
PRESIDENT/CEO	1168	0.18%
OFC/DIR	1101	0.17%
OFFICER/DIR	1064	0.17%
SVP	1049	0.16%
EVP	995	0.15%
VP/SECRETARY	978	0.15%
VP/DIR	963	0.15%
DIR	880	0.14%
VP/SEC/TREAS	869	0.14%
SECRETARY/TREAS	828	0.13%
COB	796	0.12%
SECRE	749	0.12%
T/S	725	0.11%
1ST VP	714	0.11%
CHAIR	714	0.11%
DIR/OFFICER	694	0.11%

This is begging to be normalized. e.g., P/CEO, PRES/CEO, and PRESIDENT/CEO are all the same thing. All of these abbreviations are confusing to people.