Clean up single char indexOf()

...unnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPServer.java

...erconsole/java/src/net/i2p/router/update/NewsFetcher.java

...ole/java/src/net/i2p/router/web/ConfigClientsHandler.java

apps/routerconsole/jsp/createreseed.jsp

apps/routerconsole/jsp/viewrouterlog.jsp

apps/routerconsole/jsp/viewwrapperlog.jsp

...usimail/src/src/i2p/susi/webmail/PersistentMailCache.java

core/java/src/freenet/support/CPUInformation/CPUID.java

core/java/src/net/i2p/data/Base32.java

core/java/src/net/i2p/data/Base64.java

core/java/src/net/i2p/data/DataHelper.java

core/java/src/net/i2p/util/EepGet.java

core/java/src/net/i2p/util/FileUtil.java

core/java/src/net/i2p/util/NativeBigInteger.java

...er/java/src/net/i2p/router/networkdb/reseed/Reseeder.java

router/java/src/net/i2p/router/startup/WorkingDir.java