[R-SIG-Finance] Lo catches slow

[Ilya Kipnis]

Minimum reproducible example:

require(quantmod)
require(TTR)

getSymbols('SPY')
data <- cbind(OHLC(SPY), stoch(HLC(SPY)))
head(Lo(data))
head(HLC(data))

Lo catches both the low from the OHLC object (which it's supposed to), and
the slowD column (because it has low in the name), which it isn't supposed
to.

This can cause issues down the line with other functions that call
functions that search for the Low column which might cause a dimnames error
down the line.

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