Add new short names

[josefpihrt]

a: attributes
b: attributes-to-skip
c: content
d: dry-run
e: extension
f: filter (MODIFY, CONFLICT)
g: (TARGET, PROGRESS)
h: help
i: include-directory, input
j:
k: (ASK)
l: (CONFLICT, CONTENT-ONLY)
m: max-count, manual
n: name
o: output, options
p: properties
q:
r: replacement
s: sort, section
t: highlight
u: (NO-RECURSE)
v: verbosity, values
w: words
x: (exclude-directory, CONFLICT)
y: display
z:

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F:
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I:
J:
K:
L:
M:
N:
O:
P:
Q:
R: (NO-RECURSE)
S:
T:
U:
V:
W:
X:
Y:
Z: